Abstract
THERE has been a shift away from purely passive studies of the ionosphere and magnetosphere to more active studies in which the response of these regions to a controlled manmade disturbance is determined by experiment1,2. One area of research where active experiments may be particularly useful is in the study of ultra low frequency (u.l.f.) waves in the ionosphere and magnetosphere. We do not yet completely understand these waves from observations of the geomagnetic pulsations they produce because of the great difficulty in separating source and propagation effects. This problem is particularly acute for the u.l.f. waves generating Pc 1 geomagnetic pulsations (0.2–5 Hz) where the wavelengths are small compared with the dimensions of the magnetosphere. What is needed is a controlled source of u.l.f, waves which would enable source and propagation effects to be separated. We believe we have found a technically feasible and comparatively inexpensive method for the controlled artificial generation of u.l.f. waves.
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LIPA, B., FRASER-SMITH, A., VILLARD, O. et al. Controlled artificial generation of geomagnetic pulsations. Nature 258, 311–313 (1975). https://doi.org/10.1038/258311b0
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DOI: https://doi.org/10.1038/258311b0
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